In addition to the exemptions granted pursuant to the provisions of section 144.030, there shall also be specifically exempted from all local sales taxes, as defined in section 32.085, and sections 144.010 to 144.510 and 144.600 to 144.757, and from the computation of the tax levied, assessed or payable pursuant to all local sales taxes as defined in section 32.085 and sections 144.010 to 144.525 and 144.600 to 144.811, purchases of bullion and investment coins. For purposes of this section, the following terms shall mean:
§ 144.815, RSMo